Haruki Mishima and Towa Honda are new students at Aokisora High School and best friends; at a convenience store near their high school, Haruki runs into his classmate Miharu Mashiki, a girl he's recognized since he was little.

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Disgusted by the irresponsible and talkative Towa, serious class representative Mami has been avoiding him; even when Mami begins avoiding him even more after a certain incident at the convenience store, Towa is undeterred.

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When Towa spots Miharu having a friendly conversation with their classmate Nasa Sanagi in the waiting room of a hospital, he decides to investigate Nasa's identity and his relationship with Miharu for the sake of his best friend Haruki.

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With the Sports Festival coming up, Haruki and Towa's classmates have high expectations for them as members of athletic clubs.

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After participating in the three-legged race with Mami, Towa believes they've grown closer; things don't go well when he asks her out on a date.

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Summer vacation is over, and the Aozora Cultural Festival is approaching; after things went well with Mami at the fireworks display, Towa is delighted to be spending more time with her preparing for the festival.

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Haruki worries about Miharu's absence from the cultural festival; Haruki's class encourages Mikado's childhood friend Waka Kisaki to run in the student council elections.

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Towa and Mami are steadily growing closer, but they both have concerns about their families; Towa is having trouble with his relationship with his mother, and Mami remains unable to tell her family about her relationship with Towa.

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Towa and Mami seem to return each others feelings, but their concerns push them apart; worried about the couple, Mishima and Miharu put aside their own relationship to discuss if there's anything that can be done for them.

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Haruki has been unable to focus during swim practcse since the new semester started; though his relationship with Miharu has returned to normal, he still feels as though something is lacking; Miharu begins missing school for some reason.

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Haruki has been concerned since Miharu went to the hospital and visits her every day; Towa and Mami are naturally worried about Miharu as well, but they're also concerned about Haruki.

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Miharu is scheduled to take time off from school and transfers to another hospital for surgery; she feels both anxious about the upcoming procedure and sad to be moving away from her friends.

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